JPG and JPEG are exactly the same file formats. There is no difference between a .jpg photo and a .jpeg file — both formats employ exactly the same JPEG compression standard and encode image data in the identical manner.
The sole distinction is purely in the file extension, being a relic from early computing. The JPEG format was created in 1992 by the Joint Photographic Experts Group. Early Windows released early versions of Windows, the system had a limitation: file extensions could only be three characters long.
This forced the four-character .jpeg suffix to be reduced to .jpg for Windows computers. Mac and Unix systems, not having the extension limitation, continued using the complete .jpeg extension from the beginning.
While both file types function the same in almost every modern software, there are specific scenarios in which here a platform requires the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is enough.
No real conversion of image data is necessary — just renaming the extension solves the compatibility concern in most cases.
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